<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 提示区域 -->
      <el-alert  title="商品信息添加" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤区域 -->
      <el-steps :active="step - 0" align-center finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 表单区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- tab区域 -->
        <el-tabs v-model="step" @tab-click="handleClick" :before-leave="beforeLeve"  :tab-position="'left'">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="catProps"
                @change="handleChange()"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyList" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, index ) in item.attr_vals" :key="index" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyList" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload :action="uploadPath"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              :headers="header"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"/>
            <el-button type="primary" size="mini" style="margin-top:10px;" @click="saveGoods()">保存信息</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览窗口 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      step: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类数据
      cateList: [],
      catProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态参数数据列表
      manyList: [],
      // 静态属性数据列表
      onlyList: [],
      // 上传图片服务端路径
      uploadPath: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 手动的为上传图设置请求头
      header: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览
      previewVisible: false,
      // 图片预览路径
      previewPath: ''
    }
  },
  created () {
    // 获取商品分类数据
    this.getCateList()
  },
  computed: {
    getCateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods: {
    // tab点击
    async handleClick () {
      if (this.step === '1') { // 获取动态参数数据
        const { data: res } = await this.$http.get(`categories/${this.getCateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyList = res.data
        console.log(this.manyList)
      } else if (this.step === '2') { // 获取静态属性数据
        const { data: res } = await this.$http.get(`categories/${this.getCateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return
        this.onlyList = res.data
        console.log(this.onlyList)
      }
    },
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return
      this.cateList = res.data
    },
    // 商品分类改变触发的函数
    handleChange () {
      // 只允许选择三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        return
      }
      console.log(this.addForm.goods_cat)
    },
    // 阻止标签也切换
    beforeLeve (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // 图片预览处理事件
    handlePreview (file) {
      this.previewVisible = true
      this.previewPath = file.response.data.url
    },
    // 图片移除处理事件
    handleRemove (file) {
      const path = file.response.data.tmp_path
      const index = this.addForm.pics.findIndex(x => {
        return x.pic === path
      })
      this.addForm.pics.splice(index, 1)
    },
    // 图片上传成功处理事件
    handleSuccess (response) {
      const picInfo = {
        pic: response.data.tmp_path
      }
      this.addForm.pics.push(picInfo)
    },
    // 保存商品信息
    saveGoods () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        // 深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        this.manyList.forEach(item => {
          const attr = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(',')
          }
          this.addForm.attrs.push(attr)
        })
        this.onlyList.forEach(item => {
          const attr = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(attr)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 !important;
}
</style>
